Publications
506 results found
Portilla L, Loganathan K, Faber H, et al., 2023, Wirelessly powered large-area electronics for the Internet of Things, NATURE ELECTRONICS, Vol: 6, Pages: 10-17, ISSN: 2520-1131
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- Citations: 13
Nugraha MI, Ardhi REA, Naphade D, et al., 2023, Boosting electron transport in non-fullerene acceptors using non-chlorinated solvents, Journal of Materials Chemistry C, Vol: 11, Pages: 12941-12948, ISSN: 2050-7526
Chlorinated solvents are commonly used to process organic semiconductor devices but have several negative environmental impacts. The choice of processing solvent significantly affects the layer microstructure and device performance, so replacing chlorinated solvents is non-trivial. Herein, we investigate the microstructural and electron-transporting properties of small-molecule non-fullerene acceptor (NFA) films and transistors processed from various non-chlorinated solvents. We show that the ensuing NFA transistors exhibit improved layer morphology, crystallinity, and electron mobility superior to those processed from chlorinated solvents. Our work highlights using non-chlorinated solvents to optimise charge transport in organic semiconductors and their devices while mitigating adverse environmental effects.
Griggs S, Marks A, Meli D, et al., 2022, The effect of residual palladium on the performance of organic electrochemical transistors, NATURE COMMUNICATIONS, Vol: 13
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- Citations: 9
Isikgor FH, Maksudov T, Chang X, et al., 2022, Monolithic Perovskite-Perovskite-Organic Triple-Junction Solar Cells with a Voltage Output Exceeding 3 V, ACS ENERGY LETTERS, Vol: 7, Pages: 4469-4471, ISSN: 2380-8195
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- Citations: 1
AlGhamdi WS, Fakieh A, Faber H, et al., 2022, Impact of layer thickness on the operating characteristics of In<sub>2</sub>O<sub>3</sub>/ZnO heterojunction thin-film transistors, APPLIED PHYSICS LETTERS, Vol: 121, ISSN: 0003-6951
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- Citations: 3
Vaseem M, Akhter Z, Li W, et al., 2022, High-conductivity screen-printable silver nanowire Ink for optically transparent flexible radio frequency electronics, FLEXIBLE AND PRINTED ELECTRONICS, Vol: 7, ISSN: 2058-8585
Lin Y, Zhang Y, Zhang J, et al., 2022, 18.9% Efficient Organic Solar Cells Based on n-Doped Bulk-Heterojunction and Halogen-Substituted Self-Assembled Monolayers as Hole Extracting Interlayers, ADVANCED ENERGY MATERIALS, Vol: 12, ISSN: 1614-6832
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- Citations: 10
Wahyudi W, Guo X, Ladelta V, et al., 2022, Hitherto Unknown Solvent and Anion Pairs in Solvation Structures Reveal New Insights into High-Performance Lithium-Ion Batteries, ADVANCED SCIENCE, Vol: 9
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- Citations: 16
Rotas G, Antoniou G, Papagiorgis P, et al., 2022, Doping-induced decomposition of organic semiconductors: a caveat to the use of Lewis acid p-dopants, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 10, Pages: 12751-12764, ISSN: 2050-7526
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- Citations: 3
Liang J-W, Firdaus Y, Azmi R, et al., 2022, Cl<sub>2</sub>-Doped CuSCN Hole Transport Layer for Organic and Perovskite Solar Cells with Improved Stability, ACS ENERGY LETTERS, Vol: 7, Pages: 3139-3148, ISSN: 2380-8195
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- Citations: 9
Bertrandie J, Han J, De Castro CSP, et al., 2022, The Energy Level Conundrum of Organic Semiconductors in Solar Cells, ADVANCED MATERIALS, Vol: 34, ISSN: 0935-9648
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- Citations: 50
Khan JI, Gedda M, Wang M, et al., 2022, Photophysics of Defect-Passivated Quasi-2D (PEA)<sub>2</sub>PbBr<sub>4</sub> Perovskite Using an Organic Small Molecule, ACS ENERGY LETTERS, Vol: 7, Pages: 2450-2458, ISSN: 2380-8195
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- Citations: 6
Li J, Song J, Luo L, et al., 2022, Synergy of MXene with Se Infiltrated Porous N-Doped Carbon Nanofibers as Janus Electrodes for High-Performance Sodium/Lithium-Selenium Batteries, ADVANCED ENERGY MATERIALS, Vol: 12, ISSN: 1614-6832
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- Citations: 29
Nugraha MI, Gedda M, Firdaus Y, et al., 2022, Addition of diquat enhances the electron mobility in various non-fullerene acceptor molecules, Advanced Functional Materials, ISSN: 1616-301X
Molecular doping of organic semiconductors is often used to enhance their charge transport characteristics. Despite its success, however, most studies to date concern p-doping with considerably fewer reports involving n-dopants. Here, n-doping of organic thin-film transistors (OTFTs) based on several non-fullerene acceptor (NFA) molecules using the recently developed diquat (DQ) as a soluble molecular dopant is reported. The low ionization potential of DQ facilitates efficient electron transfer and subsequent n-doping of the NFAs, resulting in a consistent increase in the electron field-effect mobility. Solution-processed BTP-eC9 and N3-based OTFTs exhibit significant increase in the electron mobility upon DQ doping, with values increasing from 0.02 to 0.17 cm2 V–1 s–1 and from 0.2 to 0.57 cm2 V–1 s–1, respectively. A remarkable electron mobility of >1 cm2 V–1 s–1 is achieved for O-IDTBR transistors upon optimal doping with DQ. The enhanced performance originates primarily from synergistic effects on electronic transport and changes in morphology, including: i) significant reduction of contact resistances, ii) formation of larger crystalline domains, iii) change of preferred crystal orientation, and iv) alteration in molecular packing motif. This work demonstrates the universality of DQ as an electronic additive for improving electron transport in OTFTs.
Xue F, Ma Y, Wang H, et al., 2022, Two-dimensional ferroelectricity and antiferroelectricity for next-generation computing paradigms, MATTER, Vol: 5, Pages: 1999-2014, ISSN: 2590-2393
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- Citations: 2
Deswal S, Panday R, Naphade DR, et al., 2022, Efficient Piezoelectric Energy Harvesting from a Discrete Hybrid Bismuth Bromide Ferroelectric Templated by Phosphonium Cation, CHEMISTRY-A EUROPEAN JOURNAL, Vol: 28, ISSN: 0947-6539
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- Citations: 3
Loganathan K, Faber H, Yengel E, et al., 2022, Rapid and up-scalable manufacturing of gigahertz nanogap diodes, NATURE COMMUNICATIONS, Vol: 13
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- Citations: 8
Eisner F, Foot G, Yan J, et al., 2022, Emissive charge-transfer states at hybrid inorganic/organic heterojunctions enable low non-radiative recombination and high-performance photodetectors, Advanced Materials, Vol: 34, ISSN: 0935-9648
Hybrid devices based on a heterojunction between inorganic and organic semiconductors have offered a means to combine the advantages of both classes of materials in optoelectronic devices, but, in practice, the performance of such devices has often been disappointing. Here, it is demonstrated that charge generation in hybrid inorganic–organic heterojunctions consisting of copper thiocyanate (CuSCN) and a variety of molecular acceptors (ITIC, IT-4F, Y6, PC70BM, C70, C60) proceeds via emissive charge-transfer (CT) states analogous to those found at all-organic heterojunctions. Importantly, contrary to what has been observed at previous organic–inorganic heterojunctions, the dissociation of the CT-exciton and subsequent charge separation is efficient, allowing the fabrication of planar photovoltaic devices with very low non-radiative voltage losses (0.21 ± 0.02 V). It is shown that such low non-radiative recombination enables the fabrication of simple and cost-effective near-IR (NIR) detectors with extremely low dark current (4 pA cm−2) and noise spectral density (3 fA Hz−1/2) at no external bias, leading to specific detectivities at NIR wavelengths of just under 1013 Jones, close to the performance of commercial silicon photodetectors. It is believed that this work demonstrates the possibility for hybrid heterojunctions to exploit the unique properties of both inorganic and organic semiconductors for high-performance opto-electronic devices.
Wijeyasinghe N, Solomeshch O, Tessler N, et al., 2022, Radiofrequency Schottky Diodes Based on p-Doped Copper(I) Thiocyanate (CuSCN), ACS APPLIED MATERIALS & INTERFACES, ISSN: 1944-8244
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- Citations: 3
Firdaus Y, He Q, Muliani L, et al., 2022, Charge transport and recombination in wide-bandgap Y6 derivatives-based organic solar cells, ADVANCES IN NATURAL SCIENCES-NANOSCIENCE AND NANOTECHNOLOGY, Vol: 13, ISSN: 2043-6254
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- Citations: 1
Gagaoudakis E, Kampitakis V, Moschogiannaki M, et al., 2022, Low-energy consumption CuSCN-based ultra-low-ppb level ozone sensor, operating at room temperature, SENSORS AND ACTUATORS A-PHYSICAL, Vol: 338, ISSN: 0924-4247
Liang J-W, Firdaus Y, Kang CH, et al., 2022, Chlorine-Infused Wide-Band Gap p-CuSCN/n-GaN Heterojunction Ultraviolet-Light Photodetectors, ACS APPLIED MATERIALS & INTERFACES, Vol: 14, Pages: 17889-17898, ISSN: 1944-8244
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- Citations: 6
Jacoutot P, Scaccabarozzi AD, Zhang T, et al., 2022, Infrared organic photodetectors employing ultralow bandgap polymer and non-fullerene acceptors for biometric monitoring, Small, Vol: 18, Pages: 1-10, ISSN: 1613-6810
Recent efforts in the field of organic photodetectors (OPD) have been focused on extending broadband detection into the near-infrared (NIR) region. Here, two blends of an ultralow bandgap push–pull polymer TQ-T combined with state-of-the-art non-fullerene acceptors, IEICO-4F and Y6, are compared to obtain OPDs for sensing in the NIR beyond 1100 nm, which is the cut off for benchmark Si photodiodes. It is observed that the TQ-T:IEICO-4F device has a superior IR responsivity (0.03 AW-1 at 1200 nm and −2 V bias) and can detect infrared light up to 1800 nm, while the TQ-T:Y6 blend shows a lower responsivity of 0.01 AW-1. Device physics analyses are tied with spectroscopic and morphological studies to link the superior performance of TQ-T:IEICO-4F OPD to its faster charge separation as well as more favorable donor–acceptor domains mixing. In the polymer blend with Y6, the formation of large agglomerates that exceed the exciton diffusion length, which leads to high charge recombination, is observed. An application of these devices as biometric sensors for real-time heart rate monitoring via photoplethysmography, utilizing infrared light, is demonstrated.
Azmi R, Ugur E, Seitkhan A, et al., 2022, Damp heat-stable perovskite solar cells with tailored-dimensionality 2D/3D heterojunctions, SCIENCE, Vol: 376, Pages: 73-+, ISSN: 0036-8075
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- Citations: 245
Kosco J, Gonzalez Carrero S, Howells CT, et al., 2022, Generation of long-lived charges in organic semiconductor heterojunction nanoparticles for efficient photocatalytic hydrogen evolution, Nature Energy, Vol: 7, Pages: 340-351, ISSN: 2058-7546
Organic semiconductor photocatalysts for the production of solar fuels are attractive as they can be synthetically tuned to absorb visible light while simultaneously retaining suitable energy levels to drive a range of processes. However, a greater understanding of the photophysics that determines the function of organic semiconductor heterojunction nanoparticles is needed to optimize performance. Here, we show that such materials can intrinsically generate remarkably long-lived reactive charges, enabling them to efficiently drive sacrificial hydrogen evolution. Our optimized hetereojunction photocatalysts comprise the conjugated polymer PM6 matched with Y6 or PCBM electron acceptors, and achieve external quantum efficiencies of 1.0% to 5.0% at 400 to 900 nm and 8.7% to 2.6% at 400 to 700 nm, respectively. Employing transient and operando spectroscopies, we find that the heterojunction structure in these nanoparticles greatly enhances the generation of long-lived charges (millisecond to second timescale) even in the absence of electron/hole scavengers or Pt. Such long-lived reactive charges open potential applications in water-splitting Z-schemes and in driving kinetically slow and technologically desirable oxidations.
Karuthedath S, Firdaus Y, Scaccabarozzi AD, et al., 2022, Trace Solvent Additives Enhance Charge Generation in Layer-by-Layer Coated Organic Solar Cells, SMALL STRUCTURES, Vol: 3
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- Citations: 13
Kumar P, Wahyudi W, Sharma A, et al., 2022, Bismuth-based mixed-anion compounds for anode materials in rechargeable batteries, CHEMICAL COMMUNICATIONS, Vol: 58, Pages: 3354-3357, ISSN: 1359-7345
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- Citations: 8
Dauzon E, Sallenave X, Plesse C, et al., 2022, Versatile methods for improving the mechanical properties of fullerene and non-fullerene bulk heterojunction layers to enable stretchable organic solar cells, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 10, Pages: 3375-3386, ISSN: 2050-7526
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- Citations: 10
Corzo D, Wang T, Gedda M, et al., 2022, A Universal Cosolvent Evaporation Strategy Enables Direct Printing of Perovskite Single Crystals for Optoelectronic Device Applications, ADVANCED MATERIALS, Vol: 34, ISSN: 0935-9648
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- Citations: 9
Karuthedath S, Gorenflot J, Firdaus Y, et al., 2022, Intrinsic efficiency limits in low-bandgap non-fullerene acceptor organic solar cells (vol 20, pg 378, 2021), NATURE MATERIALS, Vol: 21, Pages: 378-378, ISSN: 1476-1122
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